Rotary annular sole oven



NOV. 1, 1932. A TLING 1,885,673

ROTARY ANNULAR SOLE OVEN Original Filed June 22, 1928 2 Sheets-Sheet l Nov. 1, 1932. F. BARTLiNG ROTARY ANNULAR SOLE OVEN Original Filed June 22, 1928 2 Sheets-Sheet 2 Patented Nov. 1, 1932 I FRIEDRICH BAETLING, 0F MUNICH, GERMANY ROTARY ANNULAR SGLE OVEN Application filed June 22, 1928, Serial No.287,61 8, and. in. Germany July =2, 1927. Renewedfiune 30, 1932.

In the specification of the U. S. Patent No. 1,640,502 is proposed a method of working rotary'annular hearth ovens, for the treatment in particular,-of material to be distilled,

in which the said material is spread out on the rotary hearth of the oven in a layer which, in contradistinction to the practice hitherto prevailing, has a thickness amounting only to a fraction of a centimeter.

becarried outwith extraordinary rapidity, thoroughness and uniformity, with the result that an exceedingly high yield is obtained from the oven. In order to be able to utilize completely the total available oven space, it

was, of course necessary to rotate the hearth of the oven at a high speed; otherwise the treatment of the material was finished before the said material arrived at the place of discharge (which adjoins the charging device).

The further extension of this method of work ing with rotary hearth ovens of relatively large diameter, would not permit the complete utilizing of the oven surface even when the hearth plate was rotated at the highest practicable speeds.

In order to overcome this difliculty, the present invention provides a rotary annular hearth oven wherein the material to be distilled or dried is spread out on to the rotating hearth plate into the thinnest possible layer, characterized by the fact that the oven space is divided into a plurality of sections distributed around its circumference, each section being provided with a charging station and a dlscharging stat on, so that it can serve for carrying out a complete distillation or drying process.

In uslng an oven of th1s kind applicant 0 preferably aims to discharge the material under treatment in the manner proposed in the specification of the U. S. Patent No. 1,666,656. According to that method discharge of the dust-like product of the oven 1 is efiected by means of a stream of gas which is circulated through the discharging station and through a dust separator.

If this method of working is applied to an oven according to the present invention it is necessary to connect all the several discharg- In this manner the distillation process can ing stations of the oven each through a suc tion pipe and a pressure pipe to a common dust separator. i

A constructional example of the subject matter of the invention is shown in plan view, 5%; diagrammatically, in the accompanying I drawings, in which i Fig. 1 is a top plan view of an installation according to the present invention.

Fig. 2 is a radial sectional new of a portion of the oven of Fig. 1, substantially on line 2-2 of Fig. 1, on a larger scale.

Fig. 3 is a corresponding sectional view substantially on line 3-3 of Fig. 1, on a still larger scale. 1 J V The rotary annular hearth oven is constructed in the usual manner. It has an annular oven chamber a which is of inverted channel section, the open bottom being closed by the rotary hearth, b which has the form of 79 an annular plate. The total annular space in the oven chamber is divided into four sections a a a a each of which is furnished with acharging device 0 which is built back to back with the discharging device (Z of the adjoining section. In Fig. 8 the separating wall is divides the charging device 0 from the discharging device (Z, the hearth plate I) being understood to move in the direction of the arrow, so that thematerial discharged all from the lower end '0 of thecharging pipe 0 is spread out by the scraper m in a very thin layer s on this hearth plate 7) during the continuous movement of this-hearth plate; The discharging device d consists (as described in the specification of U. S. Patent No. 1,666,656) of a box, into which open a suction pipe 6 and a pressure pipe 7" so that the layer of material s which has been delivered onto the hearth plate Z2 at the charging station relan tively toward the left in Fig. 3, is engaged by the current of gas entering the chamber-b through the pipe 7 as shown by the arrows, and thus is carried along with this current of gas upwardly in the suction or discharge pipe 6. According to the present invention, all the suction pipes open into a dust separator g which may be of any suitablepattern, for the depositing of the dust contained inthe W; gas current, so that'the gas ispermittedto flow forward through the connecting pipe 6 to a pump or fan 1" whence it passes to a distributor h. All the pressure pipes go out from the distributor in which is thus connected to the clean gas side of the dust separator.

The manner in which the new oven works is as follows Through the pipes 0 of the charging boxes 0. material to be treated is projected at four places simultaneously on to the rotating annular hearth plate and, by means of suitable charge distributing arrangements such as the scraper on, is spread out into a very thin layer. The material travels with the rotary annular plate from the charging station to the next following discharging station. It is there entrained by the current of gas which circulates through the discharging device (Z, the suction pipe 6, the dust separator g, the distributor 7L and the pressure pipe f and is carried to the dust separator where it is deposited. The clean gas goes on to the distributor h, which directs it through the pressure pipes to the several discharging devices.

I claim: v

1. A rotary annular hearth oven comprising an annular hearth arranged horizontally and mounted for rotation on an axis that is vertical, said hearth being concentrically disposed relative to said axis, a casing surrounding and covering said hearth and forming an annular oven chamber above said hearth, a series of partitions extending .transversely across the casing above the hearth and divide ing the oven chamber into a plurality of equal segmental sections, devices located at one side of each partition for charging the rotating hearth-with a thin layer of pulverulent material which is to be distilled or dried, and devices arranged on the other side of each of said partitions for removing the pulverulent material from said'hearth.

2. A rotary annular hearth oven comprising an annular hearth arranged horizontally and mounted for rotation on an axis that is vertical, said hearth being concentrically disposed relative to said axis, a casing surounding and covering said hearth and forming an annular oven chamber above said hearth,a

vertical, said hearth being concentrically disposed relative to said axis, a casing surrounding and covering said hearth and forming an annular oven chamber above said hearth, a series of partitions extending transversely across the casing above the hearth and dividing the oven chamber into a plurality of equal segmental sections, devices located at one side of each partition for charging the hearth with a thin layer of pulverulent material which is to'be distilled or dried, and devices arranged at the other side of each partition for removing the pulverulent material from said hearth, the last named devices including a suctiOnpipe and a pressure pipe which is adapted to operate to blow the dust into the suction pipe, and a common dust separator connected to all of the suction pipes to receive the gas and dust therefrom, and means for returning the gas from said dust separator to said pressure pipes for establishing a circulation of the gas through the pressure pipes and suction pipes.

In testimony whereof I have signed my name to this specification.

FRIEDRICH BARTLING.

series of partitions extending transversely across the casing above the hearth and divid- :ing the oven chamber into aplurality of equal segmental sect-ions, devices located at one side of each partition for charging the hearth with a thin layer of pulverulent material whichis to be distilled or dried, and devices arranged at the other side of each partition for removing the pulverulent material from said hearth, the last named'devices including a suction pipe and a pressure ,pipe which is adapted to operate to blow the dust into the suction pipe.

3. A rotary annular hearth-oven'compris ing an annular hearth arranged horizontally and-mounted for rotation on an axis that s 

